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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66e456b93d066ef7353ca957f1fc8b0445c2c0fc6bbfb7210f079ac4887c9be1' 
  AND token = 'njccOqPYnDc8YiRfamdqxmV3RsWMW3RHuqZ9JGGo16A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}